基于dns的slave发现的实现

[codecov[bot]]

Codecov Report

Merging #153 (3f85386) into dev (f8ce299) will decrease coverage by 0.69%. The diff coverage is 75.21%.

@@            Coverage Diff             @@
##              dev     #153      +/-   ##
==========================================
- Coverage   85.71%   85.03%   -0.69%     
==========================================
  Files          24       26       +2     
  Lines        1687     1804     +117     
==========================================
+ Hits         1446     1534      +88     
- Misses        204      226      +22     
- Partials       37       44       +7     

Impacted Files	Coverage Δ
internal/slaves/dns/dns.go	75.00% <75.00%> (ø)
internal/slaves/dns/parsedsn.go	76.92% <76.92%> (ø)

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[flycash]

我先合并进去，然后我做一点微调